{
	"$schema":"http://json-schema.org/draft-03/schema#",
	"id":"http://schemas.opengis.net/gsr/1.0/field.json",
	"title":"field",
	"type":"object",
	"properties":{
	   "name":{
		  "title":"field name",
		  "type":"string",
		  "required":true
	   },
	   "type":{
		  "title":"value type",
		  "type":"string",
		  "required":true
	   },
	   "alias":{
		  "title":"alias of the field name for display purposes",
		  "type":["null","string"]
	   },
	   "length":{
		  "title":"length of the field",
		  "type":"integer"
	   }   
	}
}